In this paper, I will examine how to apply the telicity on Korean aspectual studies. The term ‘telic’ means that a verb has a terminal point as the original feature. Telicity is a very important study on the aspectual thesis, because the sentence meaning can be changed according to the telicity. This paper has three interesting foci. First, I will examine the verbal class depending on the telicity. Second, I will research into the cases how to change the telicity according to the arguments in the sentences. Finally, I will research into the function of the telicity on the aspectual studies in Korean. It is important to know that the main function of the telicity on the aspectual studies, because it can lead to the representation of the sentences.